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Chalk is a ___________ rock.
In thermal _____________ heat is used to break a chemical apart.
In ____________ a compound is broken apart using a direct current.
Oxygen is added during _________.
An _____ contains a mixture of metals.
A ___________ is made up of hydrogens and carbons only.
In ______________, short alkenes are joined together to make a long chain.
Biofuels are _________ as we can make more of them.
An ______ is a hydrocarbon with a least one double bond.
A bio ____ is often made from sugar cane.